I think @POM might be right on something she said earlier which is that they are going to somehow, inexplicably tie Mulan (sans Ruby?) to Oz. Dorothy is apparently more than a one off (yes?). If they want to make the Witch Hunter story more than one episode then Dorothy/Zelena need to have interaction with other characters and the mains (the CharMillStiltkins) are off battling the Devil. So insert the B-Cast with the other plotline
Yeah, it was said that Dorothy is recurring, and isn”t just appearing in 516. I mean we all assumed Mulan and Ruby were the planned LGBT couple, but we may have been off all along. Looking back at old interviews, it was said that the seeds for the LGBT couple would be planted in “The Bear King”, but that didn’t necessarily mean that said LGBT couple were introduced in the same episode. The seeds planted could have just been Mulan being re-introduced into the story, and how she needs to heal her broken heart. They may have never intended for Ruby to be Mulan’s future girlfriend, but rather a fellow companion to help her along the journey to find that person.